Every time you create a bill invoiced by your vendor, the affecting account is Accounts Payable. It will only reflect in the account you've setup to that vendor if the bill is already paid. However, if you want the transaction to directly affect the vendor's account, you can write a check.
You record a bill if you plan to pay the items at a future date. On the other hand, checks are used if you paid the items on-the-spot.
You'll want to read these articles about bills and checks and their workflow.
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